/*
 * Copyright (C) 2009, 2010, B3log Team
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.b3log.nide.service.maven.cmd;

import java.util.Observable;

/**
 * Command execution feedback.
 *
 * @author <a href="mailto:DL88250@gmail.com">Liang Ding</a>
 * @version 1.0.0.0, Jun 7, 2010
 */
public final class CommandFeedback extends Observable {

    /**
     * Command execution output content.
     */
    private StringBuilder output;

    /**
     * Public default constructor. Initializes {@linkplain #output}. 
     */
    public CommandFeedback() {
        output = new StringBuilder();
    }

    /**
     * Appends a line of output.
     *
     * @param line a line of output
     */
    public void append(final String line) {
        setChanged();
        output.append(line);
        notifyObservers(line);
    }

    /**
     * Gets the output content.
     *
     * @return the output content
     */
    public String getOutput() {
        return output.toString();
    }
}
